* Abbreviations:AJ, Astronomical Journal; AN, Astronomische Nachrichten; ApJ, Astrophysical Journal; BAAS, Bulletin of the American Astronomical Society; DNB, Dictionary of National Biography; DSB, Dictionary of Scientific Biography; JBAA, Journal of the British Astronomical Association; JRASC, Journal of the Royal Astronomical Society of Canada; MN, Monthly Notices of the RAS; M&P, The Moon and the Planets; MitAG, Mitteilungen der Astronomischen Gesellschaft; NAS, National Academy of Sciences Biographical Memoirs; Obs, The Observatory; PASP, Publications of the Astronomical Society of the Pacific; W, Who Was Who.